A few basic changes in PyQt6 and PySide6 regarding shader-based OpenGL graphics

8Observer8

These changes also apply to PySide6:

OpenGL classes have been moved to a separate PyQt6.QtOpenGL namespace:

PyQt5:

from PyQt5.QtGui import (QOpenGLBuffer, QOpenGLShader, QOpenGLShaderProgram,
                         QOpenGLTexture)

PyQt6:

from PyQt6.QtOpenGL import (QOpenGLBuffer, QOpenGLShader, QOpenGLShaderProgram,
                            QOpenGLTexture)

The QOpenGLWidget class has been moved to the PyQt6.QtOpenGLWidgets namespace:

PyQt5:

from PyQt5.QtWidgets import QApplication, QOpenGLWidget

PyQt6:

from PyQt6.QtOpenGLWidgets import QOpenGLWidget

Changed enum for shader types:

PyQt5:

self.program.addShaderFromSourceCode(QOpenGLShader.Vertex, vertShaderSrc)
self.program.addShaderFromSourceCode(QOpenGLShader.Fragment, fragShaderSrc)

PyQt6:

self.program.addShaderFromSourceCode(QOpenGLShader.ShaderTypeBit.Vertex, vertShaderSrc)
self.program.addShaderFromSourceCode(QOpenGLShader.ShaderTypeBit.Fragment, fragShaderSrc)

Changed enum Target texture:

PyQt5:

self.texture = QOpenGLTexture(QOpenGLTexture.Target2D)

PyQt6:

self.texture = QOpenGLTexture(QOpenGLTexture.Target.Target2D)

Changed enum for setting texture filters:

PyQt5:

self.texture.setMinMagFilters(QOpenGLTexture.Linear, QOpenGLTexture.Linear)

PyQt6:

self.texture.setMinMagFilters(QOpenGLTexture.Filter.Linear, QOpenGLTexture.Filter.Linear)

Changed enum for WrapMode:

PyQt5:

self.texture.setWrapMode(QOpenGLTexture.ClampToEdge)

PyQt6:

self.texture.setWrapMode(QOpenGLTexture.WrapMode.ClampToEdge)

Changed enum to set application attributes:

PyQt5:

QApplication.setAttribute(Qt.AA_UseDesktopOpenGL)

PyQt6:

QApplication.setAttribute(Qt.ApplicationAttribute.AA_UseDesktopOpenGL)

A few basic non-graphical changes:

Changed enum for file open mode:

PyQt5:

file = QFile(path)
if not file.open(QIODevice.ReadOnly):
    print("Failed to open the file: " + path)

PyQt6:

file = QFile(path)
if not file.open(QIODevice.OpenModeFlag.ReadOnly):
    print("Failed to open the file: " + path)

The QApplication.exec_() method has been renamed to QApplication.exec()

PyQt5:

import sys
from PyQt5.QtWidgets import QApplication

app = QApplication(sys.argv)
sys.exit(app.exec_())

PyQt6:

import sys
from PyQt6.QtWidgets import QApplication

app = QApplication(sys.argv)
sys.exit(app.exec())

8Observer8

Some examples on shader OpenGL and PyQt5:

Triangle: https://rextester.com/KWYGH93003
Texture on a rectangle: https://rextester.com/JNC31813
Loading a 3D model from a .dae (Collada) file and physics on the Bullet Physics physics engine: https://github.com/8Observer8/falling-dae-cubes-opengl-pyqt5

8Observer8

The falling COLLADA (.dae) cube using PySide6, PyQt6, Bullet Physics, and OpenGL 3.3:

You should install these packages:

pip install PySide6 (or PyQt6)
pip install PyOpenGL
pip install numpy
pip install Panda3D (for Bullet Physics)